[Ari]

If you want to get technical, your phone camera auto applies both compression and noise reduction, both you don't really want. The noise reduction cleans up images from the super tiny sensor but also smooths over fine details, especially film grain and the compression drops colors for black and white contrast. This is why when you zoom into your phone camera photos they are kinda mottled but look nice when zoomed out, the post processing is designed to make the whole image look good by dumping fine detail. When makers talk about better cameras, about half the time they are talking about better algorithms to reduce noise but still keep a sharp photo.

All of this is why camera nerds go crazy over shooting RAW, it allows you to apply post processing later instead of having it burned in.
(extra nerding, noise reduction is just really complex applications of the Fourier transform, because of this aggressive noise reduction can remove wanted periodic elements like film grain or skin texture or other patterns.)